Rotary pump



UNITED STATES PATENT oEEIoE.`

JAMES A. BAZIN, OF CANTON, MASSACHUSETTS.

ROTARY PMP.

Specification of Letters Patent No. 15,274, dated July 8, 1856.

To aZZ whom t may concern.'

Be it known that I, JAMES A. BAZIN, of Canton, in the county of Norfolkand State of Massachusetts, have invented certain new and usefulImprovements in Rotary Pumps, and that the following description, takenin connection with the accompanying draw-` ings hereinafter referred to,forms a full and exact specification of the same, wherein I have setforth-the nature and principles.

of my said improvements, by which my invention may be distinguished fromothers of a similar class, together with such parts as I claim anddesire to have secured to me by Letters Patent.

The figures of the accompanying plate of drawings represent myimprovements.

Figure l, is a central vertical section of my improved pump, Fig. 2, isa central transverse vertical section of the same, Fig. 3, is a frontelevation and Fig. 4, a similar view with the fly wheel removed andshowing the parts in a different position, Fig. 5 is a view of thefriction rolls &c. in detail.

In my improved rotary pump one piston or bucket is held stationary whilethe other is moving, and the most essential feature of my inventionconsists in a novel arrangement of devices for producing these alternatemotions of the pistons.

A rotary pump operating in this manner, that is one piston remainingstationary while the other is expelling the water, has been found to bevery effective, but in those that have heretofore been made on thisprinciple, difficulties have occurred in so producing the requisitemotions of the pistons as to prevent them from moving wit-h a great dealof friction or else the pump from leaking. By my improvements thepistons are made to move in the desired manner and with very littlefriction, while at the same time there is no possibility of leakage.

a a in the drawings represents the cylinder of a rotary pump which isshown as partly removed in order that the operation of the parts may bemore clearly seen. Two pistons ZJ and 0 are employed attached toindependent shafts, the piston Z) being 'screwed to the shaft d and thepiston 0 to the shaft e. The shaft Z is attached to a hollow sleeve f f,which revolves around the main center shaft g g to which the Hy wheel isattached. The hollow sleeve f f Lthe toggle arms p g.

extends through the center of the shaft e of the piston b and isfastened to a short crank z'. The shaft e of the piston c is secured toa short hollow sleeve 7c which revolves around the sleeve f f,`butextends no farther than the shaft al as shown in Fig. 1.

This sleeve le is attached to a crank Z placed behind the crank z' bothcranks turning on a common center g g. To the end of the crank z', areattached by a pivot oint m, the toggle arms n, 0, and to the end of thecrank Z, similar arms p, Q by a joint r, the ends of each set of armsmeeting in pivot joints s, t common to both sets, thus forming fourtoggle arms n., 0,p, g, hinged or pivoted together at four points m, r,s, t. The pivots s, t, have attached to them friction rolls u, u Fig. 5.In the front plate of the cylinder is formed a circular or nearlycircular groove w w described not from the center g, of the cranks, butfrom point 1" Fig. 3 of The portion of the groove w w is described fromthe center g of the two cranks. On the ends of the pivots s, are placedfriction rolls y, y which t into a long slot .a s of a plate a ersecured to the fly wheel. From this itwill be seen that by revolving thefly wheel, the parts being in the position shown in Fig. 3), the togglearms will move in the circle of the groove w fw turning on the pivot ras a center and thereby revolving the crank Z and consequently itspiston 0, thev other crank Z remaining stationary-until one of thefriction rolls u, o has entered the portion :v of the groove fw fw, andthel two cranks, and consequently their pistons, have been broughttogether into the position shown in Fig. 4.-, when, as the portion m mof the groove w w is described from the common journal g of the cranksas a center, the two cranks and pistons will move together through thegroove until one of the friction rolls u o, has entered the -groove ww,when the crank z' and its piston wil revolve in the same manner, as didthe crank Z and piston 0, turning upon the 'pivot m as a center whichnow occupies the lposition previously occupied by the pivot 'r'. Thecrank Z will be revolved until it comes around to the crank Z when thetwo cranks and their pistons will move together through the groove a: mas in the first instance. The eduction and induction ports b 0 are shownin Fig. 2.

From the foregoing description it will be seen that by a peculiararrangement of mechanical devices the two pistons are made to revolvealternately, one remaining stationary while the other moves.

By causing one piston to remain Xed, it acts as a head or resistance tothe water which is being forced out through the eduction port a', .bythe other piston. The two pistons it will be evident must be moved for ashort distance together, in order that the piston which has lastcompleted its circuit may be carried far enough along to open theeduction port for the discharge of the water, immediately before theother piston commences to move.

moving, as set forth.

JAMES A. BAZIN. Vitnesses:

EsRA LINCOLN, JOSEPH GAVETT.

